RU96109202A - METHOD FOR COMBUSING COAL DUST WITH AIR NECESSARY FOR COMBUSTION IN BURNERS, AND THE BURNER FOR MIXING COAL DUST WITH AIR NECESSARY FOR COMBUSTION - Google Patents

Claims (7)

1. A method of burning coal dust with air necessary for combustion in burners to which coal dust is supplied using primary air as a mixture of coal dust with primary air, moreover, in the ignition zone of the burners due to pyrolysis of coal dust from a mixture of coal dust with primary air receive primary gas with combustible gaseous components, characterized in that in the ignition zone the average ratio is reduced from the proportions of oxygen in the primary gas and from the oxygen demand for combustion of the combustible volatile components nt of primary gas by reducing the proportion of oxygen in the primary gas and / or supplying combustible extraneous gas to the primary gas.  2. The method according to p. 1, characterized in that the dust content in the primary gas is increased.  3. The method according to p. 1 or 2, characterized in that part of the primary air in the mixture of coal dust with primary air is replaced by flue gas.  4. The method according to p. 1, characterized in that the content of extraneous gas is up to 20% of the capacity of the burner.  5. A burner for burning coal dust with air necessary for combustion, divided into concentric partial flows, the burner having a primary tube (6) for dust supplying a mixture of primary air with coal dust and connected to the dust pipe (7), which is surrounded by a pipe (10) for supplying secondary air and a pipe (11) for supplying tertiary air, and the pipe (10) for supplying secondary air and the pipe (11) for supplying tertiary air pass into a conically expanding section (dividing the neck 14, 15), and t in a nozzle (10) for supplying secondary air and a tube (11) for supplying tertiary air, each has a flow swirl (22, 23), the tube (10) for supplying secondary air and the pipe (11) for supplying tertiary air are connected, each with a spiral-shaped inlet housing (16, 17), and moreover, on the outlet side of the primary dust pipe (6), a stabilizing ring (8) is located, characterized in that the primary dust pipe (6) is surrounded by a primary gas pipe (9) with the formation of an annular channel, and through the primary tube (6) for dust pass rich dust removed partial flow of the mixture and through a primary gas pipe (9) is passed a partial flow of dust-depleted mixture.  6. A burner according to claim 5, characterized in that a flow swirl (24) is located in the dust pipe (7) and after the swirl, an immersion tube (25) is located along the flow path, connected to the pipelines (26) leading outward and through a spiral the inlet housing (31) is connected to the primary dust pipe (6).  7. A burner for burning coal dust with air necessary for combustion, divided into partial streams, containing a primary tube (6) for dust supplying a stream of a mixture of primary air with coal dust and connected to a dust pipe (7), which is surrounded by a pipe (10) for supplying secondary air and a pipe (11) for supplying tertiary air, and the pipe (10) for supplying secondary air and the pipe (11) for supplying tertiary air pass into a conically expanding section (dividing the neck 14, 15), while in the pipe ( 10) to supply a second of air and a tube (11) for supplying tertiary air, each has a flow swirl (22, 23), and a pipe (10) for supplying secondary air and a pipe (11) for supplying tertiary air are each connected to a spiral-shaped inlet housing ( 16, 17), and on the outlet side of the primary dust pipe (6), a stabilizing ring (8) is located, characterized in that a gas pipe (27) is arranged around the centrally supplied air pipe (3) to form an annular gap, the outlet end which is equipped with a nozzle plate (28), in which p gas nozzles are arranged.